氧化石墨烯对大鼠角膜上皮细胞的致损伤作用

目的 探讨氧化石墨烯(oxidation of graphene,GO)对大鼠角膜上皮细胞的毒性作用.方法 体外培养Wistar雌鼠角膜上皮细胞分为正常对照组、GO干预组,正常对照组不做任何处理,GO干预组在培养时加入不同浓度(0.005 μg·L-1、0.010μg·L-1、0.020 μg·L-1、0.050 μg·L-1、0.100μg·L-1)的GO.MTT法绘制角膜上皮细胞的生长曲线、检测细胞活性;流式细胞术检测细胞的状态分布;HE染色后显微镜下观察亚细胞结构;用DAPI/PI双染以及台盼兰染色的方法进一步验证经GO干预后的细胞状态.结果 经GO干预后的角膜上皮细胞通过HE染色发现细胞内有GO的进入与残留,且细胞形态发生不规则改变,伪足部分出现纤维状结构;MTT结果显示随着GO浓度的增加,细胞活性由(81.55±1.31)％降低至(64.08±0.27)％,随着最低有效浓度的GO(O.005 μg·L-1)干预时间的增加,细胞活性由(82.61±1.36)％降低至(47.92±1.06)％;流式细胞术显示细胞破碎、死亡的比例随着GO浓度的升高,由52.9％上升至92.8％,而凋亡细胞的比例未发生明显变化;DAPI/PI双染及台盼兰染色结果均显示经GO干预后细胞死亡数目的比例急剧升高(均为P＜0.01).结论 GO对大鼠角膜上皮细胞具有毒性作用,提示GO的生物安全性存在隐患.     

生长因子对角膜上皮细胞损伤修复的作用

角膜上皮细胞是维持角膜正常生理功能的重要细胞。角膜上皮缺损,一般修复较快,但也有些角膜疾患可导致持续性角膜上皮缺损,从而此起一系列并发症,一些生长因子可促进角膜上皮的修复,开创了治疗角膜上皮持续缺损的新方法,本着重介绍与角膜上皮细胞关系密切的表皮生长因子（EGF）、血小板源性生长因子（PDGF）、成纤维细胞生长因子（FGF）、转化生长因子（TGF）、肝细胞生长因子（HGF）和角质细胞生长因子（KGF）的结构及其在角膜上皮细胞修复中的作用。     

人视网膜色素上皮细胞NF-κB的表达

目的探讨核因子κB(NFκB)在体外培养的人视网膜色素上皮(human retinal pigment epithelium,hRPE)细胞中的基础表达以及吡咯二硫代氨基甲酸乙酯(pyrolli dinedi thio carbamate,PDTC)、IL1β对NFκB表达的影响。方法体外培养的hRPE细胞经同步化后分2组分别加药:(1)无PDTC组:分别加入IL1β、生理盐水(用于检测NFκB在hRPE中的基础表达);(2)PDTC组:分别加入IL1β、生理盐水(用于检测NFκB在PDTC预处理后hRPE中的表达)。免疫荧光抗体染色、流式细胞计数法(flow cyto metry,FCM)测定上述2组标本中hRPE的NFκB的表达率。结果NFκB在hRPE中的基础表达率为8.05%,IL1β作用后表达率升高到30.26%;hRPE细胞经PDTC预处理后,NFκB的表达率下降为3.74%,加入IL1β(10μg·L-1)作用后表达率为3.66%.结论IL1β可以显著提高NFκB在hRPE细胞中的表达;PDTC可以显著降低体外培养的hRPE中的NFκB表达率,PDTC亦可显著抑制由IL1β诱导的NFκB的活化过程。     

棘阿米巴对体外培养人角膜上皮细胞的损伤作用

目的 观察棘阿米巴对体外培养人角膜上皮细胞(Corneal epithelial cells,CECs)的损伤作用.方法 以呈浓度梯度的棘阿米巴滋养体与体外培养人CECs作用,24 h内在不同时间点观察细胞的受损程度.最终选用每孔1×104mL-1的棘阿米巴滋养体与CECs作用,于3 h、6 h、9 h、24 h在光镜和扫描电镜下观察棘阿米巴致人CECs损伤的过程.结果每孔10 X 103mL-1以下浓度的棘阿米巴不能引起明显的细胞损伤,每孔0.1×106mL-1和1×106mL-1的棘阿米巴可引起细胞损伤,且随时间的延长和棘阿米巴浓度的增加,人CECs受损程度加重.棘阿米巴与CECs共培养过程中,首先看到人CECs皱缩、细胞间隙形成,然后棘阿米巴变形,伸出吸盘样结构至细胞间缝隙处,并引起细胞肿胀、空泡形成、细胞崩解及核溶解等病理变化,且阿米巴分裂、增生活跃.结论 CECs间紧密的缝隙连接是棘阿米巴侵袭人CECs的重要屏障,并引起一系列病理变化.同时CECs又可作为棘阿米巴良好的养料,促使其活跃分裂、增生,导致CECs的进一步损伤,形成恶性循环.     

α-倒捻子素对过氧化氢诱导的人视网膜色素上皮细胞损伤的保护作用

目的：研究α-倒捻子素对过氧化氢(H₂O₂)诱导的人视网膜色素上皮细胞株ARPE-19氧化损伤的保护作用。

方法：分别用不同浓度的α-倒捻子素和H₂O₂处理ARPE-19,CCK8法检测α-倒捻子素和H₂O₂对ARPE-19细胞毒性作用。不同浓度的α-倒捻子素预处理ARPE-19,再用200μmol/L H₂O₂处理24h,观察细胞活性变化。流式细胞仪检测细胞活性氧(reactive oxygen species, ROS)水平变化,免疫印迹法(Western blot)检测NF-κB蛋白表达变化。

结果：CCK8法检测结果显示：当α-倒捻子素浓度在0～12μmol/L时,ARPE-19活性无明显变化; 当浓度达到16μmol/L时,细胞活性开始下降(P<0.05)。H₂O₂诱导后,当α-倒捻子素浓度在0～16μmol/L之内时,α-倒捻子素预处理均可提高ARPE-19细胞活性。ROS结果表示：H₂O₂诱导后,ROS表达量增高(P<0.05); 8和12μmol/L α-倒捻子素预处理,均可有效清除H₂O₂诱导产生的ROS(P<0.05)。Western blot结果显示：H₂O₂诱导后NF-κB蛋白表达增高(P<0.05),12μmol/Lα-倒捻子素预处理可以继续上调H₂O₂诱导后ARPE-19的NF-κB蛋白表达(P<0.05)。

结论：H₂O₂诱导ARPE-19细胞氧化损伤,造成细胞活性下降,ROS表达量增加,经过α-倒捻子素预处理后,可有效提高细胞活性,清除ROS,活化NF-κB。     

褪黑素联合锌对H2O2诱导的人视网膜色素上皮细胞氧化损伤的保护作用

目的　探讨褪黑素（MT）联合锌（Zn）对H₂O₂诱导的人视网膜色素上皮（ARPE）细胞氧化损伤的保护作用。方法　常规培养ARPE细胞株（ARPE-19）,利用不同浓度H₂O₂处理ARPE-19细胞,将细胞存活率接近50%的H₂O₂浓度作为氧化损伤浓度。将ARPE-19细胞分为:不同浓度MT（10^-5 mol·L^-1、10^-6mol·L^-1、10^-7mol·L^-1）+ZnCl₂（15 μmol·L^-1）组,ZnCl₂组（采用15 μmol·L^-1 ZnCl₂培养细胞）,H₂O₂组（不添加MT和ZnCl₂培养细胞）,空白对照组（细胞不做任何处理）。采用流式细胞仪检测细胞凋亡情况。采用试剂盒测量各组细胞内活性氧（ROS）和丙二醛（MDA）的含量。ELISA检测各组细胞内白细胞介素-6（IL-6）和肿瘤坏死因子-α（TNF-α）的表达量。结果　当H₂O₂浓度为300 μmol·L^-1时,细胞存活率为(54.31±1.91)%,此时细胞存活率接近50%,后续实验中均选择该浓度作为氧化损伤浓度。ZnCl₂组、10^-5 mol·L^-1 MT+ZnCl₂组、10^-6 mol·L^-1 MT+ZnCl₂组、10^-7 mol·L^-1 MT+ZnCl₂组细胞凋亡率分别为3.05%、1.17%、1.50%、1.71%,与空白对照组（0）相比差异均无统计学意义（均为P>0.05）。H₂O₂组、ZnCl₂组、10^-7mol·L^-1 MT+ZnCl₂组细胞内ROS含量分别为空白对照组的1.76倍、1.59倍、1.41倍,差异均有统计学意义（均为P<0.05）;10^-5 mol·L^-1 MT+ZnCl₂组、10^-6 mol·L^-1 MT+ZnCl₂组细胞内ROS含量分别为空白对照组的1.13倍和1.25倍,差异均无统计学意义（均为P>0.05）。H₂O₂组细胞内MDA的含量较空白对照组显著提高 （P<0.05）;ZnCl₂组、10^-5 mol·L^-1 MT+ZnCl₂组、10^-6 mol·L^-1 MT+ZnCl₂组、10^-7 mol·L^-1 MT+ZnCl₂组细胞内MDA的含量均较空白对照组稍增加,差异均无统计学意义（均为P>0.05）。H₂O₂组、ZnCl₂组、10^-7 mol·L^-1 MT+ZnCl₂组细胞内IL-6和TNF-α的表达量均显著高于空白对照组,差异均有统计学意义（均为P<0.05）;10^-5 mol·L^-1MT+ZnCl₂组和10^-6 mol·L^-1 MT+ZnCl₂组细胞内IL-6和TNF-α的表达量均略高于空白对照组,差异均无统计学意义（均为P>0.05）。结论　MT联合Zn能有效降低H₂O₂损伤所致ARPE-19细胞内ROS的含量,随之减少细胞内MDA的含量,同时也能抑制IL-6和TNF-α的表达量,从而起到保护RPE细胞的作用。     

白藜芦醇对过氧化氢诱导人晶状体上皮细胞氧化损伤的保护作用

目的 探讨白藜芦醇(resveratrol,RES)对过氧化氢(H2O2)诱导人晶状体上皮细胞(human lens epithelial cells,HLEC)氧化损伤的保护作用.方法 HLEC传代培养24h后,分别加入不同浓度(5μmol·L-1、10 μmol·L-1、20 μmol·L-1、40 μmol·L-1) RES预处理12 h后,加入100 μmol·L-1 H2O2继续孵育24 h,倒置相差显微镜观察细胞形态改变,MTT比色法检测RES对H2O2诱导的HLEC活力的影响,流式细胞仪检测HLEC细胞凋亡率,比色法检测凋亡相关因子caspses-3及caspase-9的表达.结果 氧化损伤可以诱导HLEC形态改变,RES处理后,细胞形态逐渐得到改善.MTT结果显示RES对HLEC活性无抑制作用,RES(5μmol·L-1、10 μmol· L-1、20 μmol· L-1、40 μmol·L-1)孵育24 h后细胞存活率分别为(101.30±4.49)％、(100.31±3.53)％、(101.71±3.33)％、(99.30±3.00)％,与对照组(99.67±2.67)％比较,差异均无统计学意义(均为P＞0.05);模型组HLEC经氧化损伤处理后,细胞存活率(34.33±3.71)％明显下降,用20 μmol·L-1及40 μmol·L-1 RES处理后,HLEC存活率分别提高到(57.33±5.61)％和(72.67±6.98)％,与模型组比较差异均有统计学意义(均为P＜0.05).流式细胞计数结果显示:对照组HLEC凋亡率为(1.99±0.17)％,经H2O2处理后,模型组HLEC凋亡率为(51.73±4.97)％,20μmol·L-1、40 μmol·L-1 RES处理后,HLEC凋亡率分别为(34.43±3.67)％、(26.55±2.07)％,与模型组比较,差异均有统计学意义(均为P＜0.05).此外,RES还可以减少H2O2所致HLEC内caspses-3及caspase-9的表达.结论 RES可以明显抑制HLEC凋亡,其抑制凋亡的作用可能是其防止和延缓白内障发生发展的细胞学基础,从而为寻求有效的防治白内障药物提供可靠的实验依据.     

角膜创伤愈合中上皮细胞的作用初探

目的 探讨角膜创伤愈合中上皮细胞与角膜基质成纤维细胞的作用关系。方法 用形态学方法观察兔角膜损伤后上皮细胞与角膜基质成纤维细胞动态变化相关现象。结果 发现基质成纤维细胞的增生活跃程度与上皮基底细胞的细胞层数和细胞大小密切相关。结论角膜上皮细胞在角膜创伤个性中起主导作用。     

表皮生长因子对兔角膜上皮细胞生长作用的实验研究

研究了表皮生长因子（ＥＧＦ）对角膜上皮细胞的生长影响，用氚标的胸腺嘧啶核甘（＾３ＨＴｄＲ）掺入法证明ＥＧＦ单独对角膜上皮细胞无生长促进作用，而当和角膜基质块同时培养时，ＥＧＦ能够明促进膜上细胞生长，不同浓度ＥＧＦ的每分钟放射性计数（ＣＰＭ）差异均具有显著性意义（Ｐ〈０．０５或Ｐ〈０．００１），并且随ＥＧＦ浓度增加对角增上皮细胞促生长作用增强。提示ＥＧＦ能促进角膜上皮细胞的生长作用，但需要角膜基质的     

人角膜上皮细胞的体外培养方法探讨

目的:探寻角膜上皮移植细胞的体外培养方法。方法:用改良的细胞悬液培养法与组织块培养法,描绘两种方法获取细胞的生长曲线,并计算细胞倍增时间;用~3H-胸腺嘧啶核苷(~3H-TdR)掺入与液体闪烁技术观察细胞DNA合成能力。结果:改良的细胞悬液法与组织块培养法培养的细胞平均倍增时间分别为54.15± 4.28小时和67.68±1.96小时(P<0.01);应用前者培养的细胞DNA合成也明显活跃(P<0.01)。结论:从角膜缘取材,应用改良的细胞悬液培养法收集的角膜缘上皮细胞含有角膜上皮干细胞,具有更强的分裂增殖能力,更适于体外培养的角膜上皮细胞移植之用。也证实了角膜上皮干细胞存在于角膜缘基底层的观点。眼科学报 1997;13:67～69。     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

目的 探讨褪黑素(Mel)对过氧化氢(H202)氧化损伤的人视网膜色素上皮(hRPE)细胞的保护作用及其作用机制.方法 实验研究.采用600μmoL/L H2O2建立体外培养的hRPE细胞氧化损伤模型.实验分为6组:溶剂对照组、600μmoL/L H2O2+溶剂组(H2O2损伤模型组)、600μmoL/L H2O2+10-7mol/L Mel组、600μmoL/L H2O2+10-6moL/L Mel组、600 μmol/L H2O2+10-5mol/L Mel组、600μmol/L H2O2+10-4moL/L Mel组.通过四甲基偶氮唑盐(MTT))法检测细胞活性;测定细胞内超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量以反映细胞氧化损伤程度;分别用DNA Ladders电泳法和流式细胞仪检测细胞的凋亡情况.溶剂对照组与600μmol/L H2O2组间均数比较采用随机区组设计的t检验;600μmol/L H2O2组以及600μmol/L H2O2+不同浓度Mel组间均数比较采用单因素5水平设计的方差分析,组间两两比较采用LSD-t检验.结果 H2O2模型组较对照组细胞活性明显降低、SOD活件降低、MDA含量增加、凋亡率升高,差异均有统计学意义(t=2.25,39.50,68.42;P<0.05);Mel干预组较模型组细胞活性升高、SOD活性升高、MDA含最减少、凋亡率降低,差异有统计学意义(P<0.05),并与药物浓度的变化呈正相关趋势.结论 Mel对H2O2诱导的RPE的氧化损伤具有保护作用,其机制可能与影响细胞活性、增强抗氧化酶活性、减少细胞凋亡有关.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.     

褪黑素对体外培养的人视网膜色素上皮细胞氧化损伤的保护作用

Objective To investigate the protective effects of melatonin on the retinal pigment epithelium (RPE) against oxidative damage induced by hydrogen dioxide (H2O2) and its mechanism. Methods The RPE cells were seeded and divided into normol control group, oxidative damage group and the treatment group (treated with melatonin at the concentration of 1×10.7 mol/L,1×10-6 mol/L, 1×10-5 mol/L and 1×10-4 mol/L). The model of oxidative damage on the RPE cells was established by culturing the RPE cells with H2O2 at the concentration of 600 μmol/L for 1 hour in vitro. The cell viability of RPE cells was detected by the methyl thiazolyl tetrazolium (MTT) method. The degree of oxidative damage was evaluated by detecting the superoxide dismutase (SOD) and maleic dialdehyde (MDA). Apoptosis was detected qualitatively using the DNA Ladders electrophoretic mothed, and quantitatively using the Annexin V-FITC/PI double staining flow cytometry. Results Compared with normal control group, the oxidative damage group had low cell viability, low SOD and high MDA contents, and high apoptosis rate(t=2.25,39.50,68.42;P<0.05). Compared with oxidative damage group, the treatment group had high cell viability, high SOD and low M DA contents, and low apoptosis rate (P<0.05). Conclusions Melatonin has a protective effect on the RPE against oxidative damage induced by H2O2. The mechanism may involve in reinforcing the cell viability, strengthening the activity of antioxidase, and reducing the apoptosis.